Tool feeding apparatus



H. C. GUSTFSON TOOL FEEDING APPARATUS Filed may .31,v 1928 4 Sheets-Sheet l Mg., @E w32.

my ww F535 @a 3932:. H. cA GUSTAFSQN f? TOOL FEEDING APPARATUS Filed May 3l, 1928 4 Sheets-Sheet 2 4 Sheets-Sheet 4 H.C.GUTAFSCN.

TOOL FEEDING APPARATUS Flled May 3l 1928 Patented Feb. 9, 1932 UNITED STATES PATENT QFFEC HJALMER C. GUSTAFSON, OF DENVER, COLORADO, ASSIGNOB. TO GARDNER-DENVER COMPANY, OF DENVER, COLORADO, A CORPORATION' OF. DELAVIARE TOOL FEEDING- APPARATUS .ApplicationV led May 31, 1928. Serialy No. 281,914.

respectively on the lines 5, 6 6 and 7 7 y of Figure 2.

Figure 8 is a sectional view on the line 8 8 of Figure 7.

Figures 9 and 10 are detail sectional views through the lvalve mechanism, showing the valve in dilferent positions.

Figure 11 is a longitudinal sectional view oi' the mounting for connecting the draft strap to the drill.

Figure 12 is a plan view of the same.

Figure 13 is a detail sectional view through a portion of the feed cylinder and feedpiston.

Figure 14 is a detail view of one end of the feed cylinder and its mounting.

In the embodiment disclosed, a supporting frame is employed, preferably made up of a plurality of structural units. As shown, this frame consists of side channel bars 14,

' to the upper flange of which areA riveted guide plates 15 that extend inwardly beyond the channel bars and cooperate with angle bars 16 riveted to the inner sides of the webs of the channel bars 14. The plates 15 and angle bars 16 thus form between them guidewa-ys 17. The channel bars in turn are riveted to transverse bridge pieces, towit, a front bridge piece 18, a central bridge piece 19, and a rear bridge piece 20. The front bridge piece 18 is provided wthv a depending collar 21 (see Fig. 6). The'central bridge piece 19 is provided with a depending collar 22 (see Fig. 5). The rear bridge piece 20 is provided with a depending collar 23 (see Figure 7), these collars being in alinement.

shank is the shank 31 of a head 32 that clamps a forwardly facing packing cup 33.

Fixed to the ends of the frame bars 14 are brackets 34, in which are journaled flanged pulleys 35, and around these pulleys pass flexible draft straps 36 and 37 that are preferably of suitable sheet metal. These draft straps extend into the opposite ends of the cylinder 24 and have their ends riveted respectively toextensions 38 and 39 formed on the heads 27 and 32. The straps 36 are also connected to the drill which is mounted in the guideways 17. This drill may be of any well known character and is shown generally at 40. ik known type of drill may be employed,.such as a drifting drill,v which is ordinarily providerL with flanges 41 slidable in a guide shell, these llanges 4as illustrated in Figure 4 operating in the guideways 17 of the present frame and said frame constituting in effect a guide shell. As is well known, such drills usually have a screw feed and are consequently provided with a depending collar 42, in which is mounted the nut engaged by the feed screw. In the present case, said collar 42 is used as a holder for the mounting that connects the draft straps 36 and 37 to the drill. L

Referring particularly ,to Figures 11 and 12, this mounting consists of an anchor sleeve 34 litted into the collar 42 and having a shouldei` 44 abutting against one end of said collar. The other end of the sleeve is' threaded to receive a holding nut 45 that abuts aainst .iii

the opposite end of said collar42'. Thissleeve 43 is provided at its front end with spaced projecting ears, connected by a cross .pin 46 that" receives an eye 47 riveted to the front draft strap 37. Tlie'reardraft strap 36 has also secured to it a pair of eyes 48 connected by a cross pin a9 that passes through an eye 50 of plunger shank 5l having a head 52 slidable in the anchor sleeve 48. As shown and as preferably constructed the interior of said anchor sleeve is angular in cross section and the head 52 is correspondingly shaped so that the head and stem 5l cannot turn or rotate. rEhreaded onto the rear end of the anchor sleeve is an adjustable cap 53 against which hears the rear end of a coiled spring 5d housed within the anchor sleeve 43 and also bearing against the head lt will be evident therefore that the rear draft strap has a. yielding mounting orvconnection with the drill lO.

The ends of the feed cylinder 24 are closed by packing glands through which the straps 36and 87 pass. fis these glands are substantially the same at both ends of the cylinder, but one is shown, and that in Figure 18. A plug, comprising sect-ions is fitted into the end of the cylinder and abuts a shoulder 56 formed therein. An outer or compression plug comprising sections 57 also is fitted into the cylinder' and between the two is placed Vpacking material 58. The adjacent ends of the'two plugs are preferably concaved as illustrated. Surrounding the outer or com- Apression plug 57 and abutting against a shoulder 59 thereof is a holding ring 60 having a notch 6l that receives a pin 62 located in one of the plug` sections 57 to prevent the turning of the plug. T his ring 60 has oppositely outstanding ears 63 (see Fig. through which pass cap screws 64 that engage in extensions Sila of the collars 2l.

The collar 22 of the central bridge piece 19 is provided with a mounting cone 65. The collar 28 of the rear bridge piece 20 is provided with a transversely disposed valve chamber 66 having a bushing sleeve 67. A. motive fluid supply nipple 68 depends from this collar 23 and opens into the valve chainber. As shown in Figures 8, 9 and l() a combined supply and exhaust port 69 opens from one side of the valve chamber into the rear end of the cylinder 24, and another combined supply and exhaust passageway 70 opens from the opposite side of said valve chainer. rlhis passageway 70 leads to a pipe 7l that exte. ds longitudinally along the cylinder 24 and is in communication with the front end of the cylinder as indicated in dotted lines at 72 in Figure 2. The valve charnber furthermore is provided with an exhaust port 73.

A rotatable valve 74 is located vin the valve chamber 66 and has a stem 7 5 projecting from the sleeve and provided with an actuating handle 76. This valve has an annular groove '.7 7 in constant communication with the sup ply nipple 68 (see Figure 7) and leading from said groove is a channel 78 as shown in Figures 9 and 10, Awhich'channel is adapted to move into communication with either passageway 69 or 7 O, according to the position assumed by the valve. Obviously therefore fluid under pressure supplied through the nipple 68 can be distributed to either end of the cylinder '24 and thus in advance ol or behind the piston in said cylinder. The valve 74 furthermore has a central longitudinal exhaust bore 79` that opens into an annular channel 8O formed in the periphery of the valve, which channel is in constant communication with the exhaust port 7 3. A transverse port 8l opens from the inner end of the bore 79 to the periphery of the valve and opposite the channel 7 8 so that when said channel 7 8 is in communication with one of the passageways 69-70 the port 81 will be in communication with the other passageway (see Figures 9-10).

With this construction, it will be evident that if the drill is at the rear end of the guide shell or supporting frame, the feed piston 25 will be at the front end of the feed cylinder. If now the valve 74 is turned to admit motive fluid through the passageways 70-7l, it will act upon the front end of the piston and move the same rearwardly. This causes a draft strain upon the front draft strap 87, suiiicient to advance the tool as the drilling proceeds. When it is desired to move the drill rearwardly, it is only necessaryA to turn the valve so that the supply channel 78 is in communication with the passageway 69, whereupon motive iuid will be admitted behind the piston to move it forwardly causing draft upon the rear strap 86 and pulling the drill rearwardly.

From the foregoing, it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art, without further description, and it will be understood that various changes in the size, shape, proportion and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

That I claim is:

l. In drilling apparatus, the combination with supporting frame having a guideway for the drill, of a drill movably mounted in the guideway and having a collar portion, a motor for advancingthe drilljto its work as the' drillingprogresses Vand comprising a cylinder mounted on the frame, a piston in the cylinder, oppositely extending flexible connections secured to the piston, an anchor sleeve fixed in the collar portion of the drill, one of said flexible connections being secured to the anchor sleeve, anda yielding plunger in the sleeve, and having the other flexible connection secured thereto.`

2. In drilling apparatus, the combination with a vguide shell having collars, of a drill slidably mounted in the guide shell, a feed cylinder mounted in the collars, a piston in the cylinder, longitudinally movable flexible connections between the ends of the piston and the drill, pulleys at the ends of the guide shell and about Which the flexible connections pass, a valve chamber formed in one of the collars, passageways leading from the valve chamber to the front and rear ends of the cylinder, means for supplying motive fluid to the valve chamber, and a valve in the valve chamber controlling the supply of motive fluid to the passageways and its exhaust therefrom.

3. In drilling apparatus, the combination With a guide shell, of a central collar depending therefrom and having a mounting cone, end collars also depending from the ends of the guide shell, pulley brackets secured at the ends of the guide shell and having pulleys journaled therein, a drill slidably mounted in the guide shell and having a collar on its underside, a cylinder secured in the guide shell collars and disposed longitudinally of said shell, a piston in the cylinder, flexible bands secured to the piston, passing through the ends of the cylinder and around the pulleys, an anchor sleeve secured in the drill collar, the front band being fixed to the anchor sleeve, a yielding` plunger in the anchor sleeve secured to the rear band, one of said guide shell collars having a valve charnber Jformed therein, passageways leading from the valve chamber to the ends of the cylinder member, and a valve in the valve chamber controlling said passageways.

In testimony whereof, I affix my signature.

HJALMER C. GUSTAFSON. 

